Can u put a 2005 MB c-class sport steering wheel on a 2004 MB c-class sport?

Yes.





The switch can't be done between the newer C-class model and the older W203 model, but both models you refer to are W203 models.





I'm not sure how to do it or how much it costs, but it is certainly doable.

Can u put a 2005 MB c-class sport steering wheel on a 2004 MB c-class sport?
Why, is the 05 wheel that much better than the 04? Seems itd be too much trouble for little tangible gain.